I am using RBTOOLS to model a roof layout and I have done it many times in the past, but it has been a long while. For some reason when I go to object viewer there is now a white square "ground plane" below the roof slabs (see image) and I don't know how to get rid of it. I pretty sure I've done this in the past and never had to deal with the white square "ground plane". "Ground plane" is turned off for each of the slabs. Please help as this is quite frustrating as it has never been an issue in the past!!! What am I suddenly doing wrong???